src/content/browser/plugin_service_impl.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "content/browser/plugin_service_impl.h"
   6
   7 #include "base/bind.h"
   8 #include "base/command_line.h"
   9 #include "base/compiler_specific.h"
  10 #include "base/files/file_path.h"
  11 #include "base/message_loop/message_loop.h"
  12 #include "base/message_loop/message_loop_proxy.h"
  13 #include "base/metrics/histogram.h"
  14 #include "base/path_service.h"
  15 #include "base/strings/string_util.h"
  16 #include "base/strings/utf_string_conversions.h"
  17 #include "base/synchronization/waitable_event.h"
  18 #include "base/threading/thread.h"
  19 #include "content/browser/ppapi_plugin_process_host.h"
  20 #include "content/browser/renderer_host/render_process_host_impl.h"
  21 #include "content/browser/renderer_host/render_view_host_impl.h"
  22 #include "content/common/pepper_plugin_list.h"
  23 #include "content/common/plugin_list.h"
  24 #include "content/common/view_messages.h"
  25 #include "content/public/browser/browser_thread.h"
  26 #include "content/public/browser/content_browser_client.h"
  27 #include "content/public/browser/plugin_service_filter.h"
  28 #include "content/public/browser/resource_context.h"
  29 #include "content/public/common/content_constants.h"
  30 #include "content/public/common/content_switches.h"
  31 #include "content/public/common/process_type.h"
  32 #include "content/public/common/webplugininfo.h"
  33
  34 #if defined(OS_WIN)
  35 #include "content/common/plugin_constants_win.h"
  36 #include "ui/gfx/win/hwnd_util.h"
  37 #endif
  38
  39 #if defined(OS_POSIX)
  40 #include "content/browser/plugin_loader_posix.h"
  41 #endif
  42
  43 #if defined(OS_POSIX) && !defined(OS_OPENBSD) && !defined(OS_ANDROID)
  44 using ::base::FilePathWatcher;
  45 #endif
  46
  47 namespace content {
  48 namespace {
  49
  50 // This enum is used to collect Flash usage data.
  51 enum FlashUsage {
  52   // Number of browser processes that have started at least one NPAPI Flash
  53   // process during their lifetime.
  54   START_NPAPI_FLASH_AT_LEAST_ONCE,
  55   // Number of browser processes that have started at least one PPAPI Flash
  56   // process during their lifetime.
  57   START_PPAPI_FLASH_AT_LEAST_ONCE,
  58   // Total number of browser processes.
  59   TOTAL_BROWSER_PROCESSES,
  60   FLASH_USAGE_ENUM_COUNT
  61 };
  62
  63 bool LoadPluginListInProcess() {
  64 #if defined(OS_WIN)
  65   return true;
  66 #else
  67   // If on POSIX, we don't want to load the list of NPAPI plugins in-process as
  68   // that causes instability.
  69
  70   // Can't load the plugins on the utility thread when in single process mode
  71   // since that requires GTK which can only be used on the main thread.
  72   if (RenderProcessHost::run_renderer_in_process())
  73     return true;
  74
  75   return !PluginService::GetInstance()->NPAPIPluginsSupported();
  76 #endif
  77 }
  78
  79 // Callback set on the PluginList to assert that plugin loading happens on the
  80 // correct thread.
  81 void WillLoadPluginsCallback(
  82     base::SequencedWorkerPool::SequenceToken token) {
  83   if (LoadPluginListInProcess()) {
  84     CHECK(BrowserThread::GetBlockingPool()->IsRunningSequenceOnCurrentThread(
  85         token));
  86   } else {
  87     CHECK(false) << "Plugin loading should happen out-of-process.";
  88   }
  89 }
  90
  91 #if defined(OS_MACOSX)
  92 void NotifyPluginsOfActivation() {
  93   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
  94
  95   for (PluginProcessHostIterator iter; !iter.Done(); ++iter)
  96     iter->OnAppActivation();
  97 }
  98 #endif
  99
 100 #if defined(OS_POSIX) && !defined(OS_OPENBSD) && !defined(OS_ANDROID)
 101 void NotifyPluginDirChanged(const base::FilePath& path, bool error) {
 102   if (error) {
 103     // TODO(pastarmovj): Add some sensible error handling. Maybe silently
 104     // stopping the watcher would be enough. Or possibly restart it.
 105     NOTREACHED();
 106     return;
 107   }
 108   VLOG(1) << "Watched path changed: " << path.value();
 109   // Make the plugin list update itself
 110   PluginList::Singleton()->RefreshPlugins();
 111   BrowserThread::PostTask(
 112       BrowserThread::UI, FROM_HERE,
 113       base::Bind(&PluginService::PurgePluginListCache,
 114                  static_cast<BrowserContext*>(NULL), false));
 115 }
 116 #endif
 117
 118 }  // namespace
 119
 120 // static
 121 PluginService* PluginService::GetInstance() {
 122   return PluginServiceImpl::GetInstance();
 123 }
 124
 125 void PluginService::PurgePluginListCache(BrowserContext* browser_context,
 126                                          bool reload_pages) {
 127   for (RenderProcessHost::iterator it = RenderProcessHost::AllHostsIterator();
 128        !it.IsAtEnd(); it.Advance()) {
 129     RenderProcessHost* host = it.GetCurrentValue();
 130     if (!browser_context || host->GetBrowserContext() == browser_context)
 131       host->Send(new ViewMsg_PurgePluginListCache(reload_pages));
 132   }
 133 }
 134
 135 // static
 136 PluginServiceImpl* PluginServiceImpl::GetInstance() {
 137   return Singleton<PluginServiceImpl>::get();
 138 }
 139
 140 PluginServiceImpl::PluginServiceImpl()
 141     : filter_(NULL) {
 142   // Collect the total number of browser processes (which create
 143   // PluginServiceImpl objects, to be precise). The number is used to normalize
 144   // the number of processes which start at least one NPAPI/PPAPI Flash process.
 145   static bool counted = false;
 146   if (!counted) {
 147     counted = true;
 148     UMA_HISTOGRAM_ENUMERATION("Plugin.FlashUsage", TOTAL_BROWSER_PROCESSES,
 149                               FLASH_USAGE_ENUM_COUNT);
 150   }
 151 }
 152
 153 PluginServiceImpl::~PluginServiceImpl() {
 154 #if defined(OS_WIN)
 155   // Release the events since they're owned by RegKey, not WaitableEvent.
 156   hkcu_watcher_.StopWatching();
 157   hklm_watcher_.StopWatching();
 158   if (hkcu_event_)
 159     hkcu_event_->Release();
 160   if (hklm_event_)
 161     hklm_event_->Release();
 162 #endif
 163   // Make sure no plugin channel requests have been leaked.
 164   DCHECK(pending_plugin_clients_.empty());
 165 }
 166
 167 void PluginServiceImpl::Init() {
 168   plugin_list_token_ = BrowserThread::GetBlockingPool()->GetSequenceToken();
 169   PluginList::Singleton()->set_will_load_plugins_callback(
 170       base::Bind(&WillLoadPluginsCallback, plugin_list_token_));
 171
 172   RegisterPepperPlugins();
 173
 174   // The --site-per-process flag enables an out-of-process iframes
 175   // prototype, which uses WebView for rendering. We need to register the MIME
 176   // type we use with the plugin, so the renderer can instantiate it.
 177   const CommandLine* command_line = CommandLine::ForCurrentProcess();
 178   if (command_line->HasSwitch(switches::kSitePerProcess)) {
 179     WebPluginInfo webview_plugin(
 180         ASCIIToUTF16("WebView Tag"),
 181         base::FilePath(),
 182         ASCIIToUTF16("1.2.3.4"),
 183         ASCIIToUTF16("Browser Plugin."));
 184     webview_plugin.type = WebPluginInfo::PLUGIN_TYPE_NPAPI;
 185     WebPluginMimeType webview_plugin_mime_type;
 186     webview_plugin_mime_type.mime_type = "application/browser-plugin";
 187     webview_plugin_mime_type.file_extensions.push_back("*");
 188     webview_plugin.mime_types.push_back(webview_plugin_mime_type);
 189     RegisterInternalPlugin(webview_plugin, true);
 190   }
 191
 192   // Load any specified on the command line as well.
 193   base::FilePath path =
 194       command_line->GetSwitchValuePath(switches::kLoadPlugin);
 195   if (!path.empty())
 196     AddExtraPluginPath(path);
 197   path = command_line->GetSwitchValuePath(switches::kExtraPluginDir);
 198   if (!path.empty())
 199     PluginList::Singleton()->AddExtraPluginDir(path);
 200
 201   if (command_line->HasSwitch(switches::kDisablePluginsDiscovery))
 202     PluginList::Singleton()->DisablePluginsDiscovery();
 203 }
 204
 205 void PluginServiceImpl::StartWatchingPlugins() {
 206   // Start watching for changes in the plugin list. This means watching
 207   // for changes in the Windows registry keys and on both Windows and POSIX
 208   // watch for changes in the paths that are expected to contain plugins.
 209 #if defined(OS_WIN)
 210   if (hkcu_key_.Create(HKEY_CURRENT_USER,
 211                        kRegistryMozillaPlugins,
 212                        KEY_NOTIFY) == ERROR_SUCCESS) {
 213     if (hkcu_key_.StartWatching() == ERROR_SUCCESS) {
 214       hkcu_event_.reset(new base::WaitableEvent(hkcu_key_.watch_event()));
 215       base::WaitableEventWatcher::EventCallback callback =
 216             base::Bind(&PluginServiceImpl::OnWaitableEventSignaled,
 217                        base::Unretained(this));
 218       hkcu_watcher_.StartWatching(hkcu_event_.get(), callback);
 219     }
 220   }
 221   if (hklm_key_.Create(HKEY_LOCAL_MACHINE,
 222                        kRegistryMozillaPlugins,
 223                        KEY_NOTIFY) == ERROR_SUCCESS) {
 224     if (hklm_key_.StartWatching() == ERROR_SUCCESS) {
 225       hklm_event_.reset(new base::WaitableEvent(hklm_key_.watch_event()));
 226       base::WaitableEventWatcher::EventCallback callback =
 227             base::Bind(&PluginServiceImpl::OnWaitableEventSignaled,
 228                        base::Unretained(this));
 229       hklm_watcher_.StartWatching(hklm_event_.get(), callback);
 230     }
 231   }
 232 #endif
 233 #if defined(OS_POSIX) && !defined(OS_OPENBSD) && !defined(OS_ANDROID)
 234 // On ChromeOS the user can't install plugins anyway and on Windows all
 235 // important plugins register themselves in the registry so no need to do that.
 236
 237   // Get the list of all paths for registering the FilePathWatchers
 238   // that will track and if needed reload the list of plugins on runtime.
 239   std::vector<base::FilePath> plugin_dirs;
 240   PluginList::Singleton()->GetPluginDirectories(&plugin_dirs);
 241
 242   for (size_t i = 0; i < plugin_dirs.size(); ++i) {
 243     // FilePathWatcher can not handle non-absolute paths under windows.
 244     // We don't watch for file changes in windows now but if this should ever
 245     // be extended to Windows these lines might save some time of debugging.
 246 #if defined(OS_WIN)
 247     if (!plugin_dirs[i].IsAbsolute())
 248       continue;
 249 #endif
 250     FilePathWatcher* watcher = new FilePathWatcher();
 251     VLOG(1) << "Watching for changes in: " << plugin_dirs[i].value();
 252     BrowserThread::PostTask(
 253         BrowserThread::FILE, FROM_HERE,
 254         base::Bind(&PluginServiceImpl::RegisterFilePathWatcher, watcher,
 255                    plugin_dirs[i]));
 256     file_watchers_.push_back(watcher);
 257   }
 258 #endif
 259 }
 260
 261 PluginProcessHost* PluginServiceImpl::FindNpapiPluginProcess(
 262     const base::FilePath& plugin_path) {
 263   for (PluginProcessHostIterator iter; !iter.Done(); ++iter) {
 264     if (iter->info().path == plugin_path)
 265       return *iter;
 266   }
 267
 268   return NULL;
 269 }
 270
 271 PpapiPluginProcessHost* PluginServiceImpl::FindPpapiPluginProcess(
 272     const base::FilePath& plugin_path,
 273     const base::FilePath& profile_data_directory) {
 274   for (PpapiPluginProcessHostIterator iter; !iter.Done(); ++iter) {
 275     if (iter->plugin_path() == plugin_path &&
 276         iter->profile_data_directory() == profile_data_directory) {
 277       return *iter;
 278     }
 279   }
 280   return NULL;
 281 }
 282
 283 PpapiPluginProcessHost* PluginServiceImpl::FindPpapiBrokerProcess(
 284     const base::FilePath& broker_path) {
 285   for (PpapiBrokerProcessHostIterator iter; !iter.Done(); ++iter) {
 286     if (iter->plugin_path() == broker_path)
 287       return *iter;
 288   }
 289
 290   return NULL;
 291 }
 292
 293 PluginProcessHost* PluginServiceImpl::FindOrStartNpapiPluginProcess(
 294     int render_process_id,
 295     const base::FilePath& plugin_path) {
 296   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 297
 298   if (filter_ && !filter_->CanLoadPlugin(render_process_id, plugin_path))
 299     return NULL;
 300
 301   PluginProcessHost* plugin_host = FindNpapiPluginProcess(plugin_path);
 302   if (plugin_host)
 303     return plugin_host;
 304
 305   WebPluginInfo info;
 306   if (!GetPluginInfoByPath(plugin_path, &info)) {
 307     return NULL;
 308   }
 309
 310   // Record when NPAPI Flash process is started for the first time.
 311   static bool counted = false;
 312   if (!counted && UTF16ToUTF8(info.name) == kFlashPluginName) {
 313     counted = true;
 314     UMA_HISTOGRAM_ENUMERATION("Plugin.FlashUsage",
 315                               START_NPAPI_FLASH_AT_LEAST_ONCE,
 316                               FLASH_USAGE_ENUM_COUNT);
 317   }
 318
 319   // This plugin isn't loaded by any plugin process, so create a new process.
 320   scoped_ptr<PluginProcessHost> new_host(new PluginProcessHost());
 321   if (!new_host->Init(info)) {
 322     NOTREACHED();  // Init is not expected to fail.
 323     return NULL;
 324   }
 325   return new_host.release();
 326 }
 327
 328 PpapiPluginProcessHost* PluginServiceImpl::FindOrStartPpapiPluginProcess(
 329     int render_process_id,
 330     const base::FilePath& plugin_path,
 331     const base::FilePath& profile_data_directory) {
 332   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 333
 334   if (filter_ && !filter_->CanLoadPlugin(render_process_id, plugin_path))
 335     return NULL;
 336
 337   PpapiPluginProcessHost* plugin_host =
 338       FindPpapiPluginProcess(plugin_path, profile_data_directory);
 339   if (plugin_host)
 340     return plugin_host;
 341
 342   // Validate that the plugin is actually registered.
 343   PepperPluginInfo* info = GetRegisteredPpapiPluginInfo(plugin_path);
 344   if (!info)
 345     return NULL;
 346
 347   // Record when PPAPI Flash process is started for the first time.
 348   static bool counted = false;
 349   if (!counted && info->name == kFlashPluginName) {
 350     counted = true;
 351     UMA_HISTOGRAM_ENUMERATION("Plugin.FlashUsage",
 352                               START_PPAPI_FLASH_AT_LEAST_ONCE,
 353                               FLASH_USAGE_ENUM_COUNT);
 354   }
 355
 356   // This plugin isn't loaded by any plugin process, so create a new process.
 357   return PpapiPluginProcessHost::CreatePluginHost(
 358       *info, profile_data_directory);
 359 }
 360
 361 PpapiPluginProcessHost* PluginServiceImpl::FindOrStartPpapiBrokerProcess(
 362     int render_process_id,
 363     const base::FilePath& plugin_path) {
 364   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 365
 366   if (filter_ && !filter_->CanLoadPlugin(render_process_id, plugin_path))
 367     return NULL;
 368
 369   PpapiPluginProcessHost* plugin_host = FindPpapiBrokerProcess(plugin_path);
 370   if (plugin_host)
 371     return plugin_host;
 372
 373   // Validate that the plugin is actually registered.
 374   PepperPluginInfo* info = GetRegisteredPpapiPluginInfo(plugin_path);
 375   if (!info)
 376     return NULL;
 377
 378   // TODO(ddorwin): Uncomment once out of process is supported.
 379   // DCHECK(info->is_out_of_process);
 380
 381   // This broker isn't loaded by any broker process, so create a new process.
 382   return PpapiPluginProcessHost::CreateBrokerHost(*info);
 383 }
 384
 385 void PluginServiceImpl::OpenChannelToNpapiPlugin(
 386     int render_process_id,
 387     int render_view_id,
 388     const GURL& url,
 389     const GURL& page_url,
 390     const std::string& mime_type,
 391     PluginProcessHost::Client* client) {
 392   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 393   DCHECK(!ContainsKey(pending_plugin_clients_, client));
 394   pending_plugin_clients_.insert(client);
 395
 396   // Make sure plugins are loaded if necessary.
 397   PluginServiceFilterParams params = {
 398     render_process_id,
 399     render_view_id,
 400     page_url,
 401     client->GetResourceContext()
 402   };
 403   GetPlugins(base::Bind(
 404       &PluginServiceImpl::ForwardGetAllowedPluginForOpenChannelToPlugin,
 405       base::Unretained(this), params, url, mime_type, client));
 406 }
 407
 408 void PluginServiceImpl::OpenChannelToPpapiPlugin(
 409     int render_process_id,
 410     const base::FilePath& plugin_path,
 411     const base::FilePath& profile_data_directory,
 412     PpapiPluginProcessHost::PluginClient* client) {
 413   PpapiPluginProcessHost* plugin_host = FindOrStartPpapiPluginProcess(
 414       render_process_id, plugin_path, profile_data_directory);
 415   if (plugin_host) {
 416     plugin_host->OpenChannelToPlugin(client);
 417   } else {
 418     // Send error.
 419     client->OnPpapiChannelOpened(IPC::ChannelHandle(), base::kNullProcessId, 0);
 420   }
 421 }
 422
 423 void PluginServiceImpl::OpenChannelToPpapiBroker(
 424     int render_process_id,
 425     const base::FilePath& path,
 426     PpapiPluginProcessHost::BrokerClient* client) {
 427   PpapiPluginProcessHost* plugin_host = FindOrStartPpapiBrokerProcess(
 428       render_process_id, path);
 429   if (plugin_host) {
 430     plugin_host->OpenChannelToPlugin(client);
 431   } else {
 432     // Send error.
 433     client->OnPpapiChannelOpened(IPC::ChannelHandle(), base::kNullProcessId, 0);
 434   }
 435 }
 436
 437 void PluginServiceImpl::CancelOpenChannelToNpapiPlugin(
 438     PluginProcessHost::Client* client) {
 439   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 440   DCHECK(ContainsKey(pending_plugin_clients_, client));
 441   pending_plugin_clients_.erase(client);
 442 }
 443
 444 void PluginServiceImpl::ForwardGetAllowedPluginForOpenChannelToPlugin(
 445     const PluginServiceFilterParams& params,
 446     const GURL& url,
 447     const std::string& mime_type,
 448     PluginProcessHost::Client* client,
 449     const std::vector<WebPluginInfo>&) {
 450   GetAllowedPluginForOpenChannelToPlugin(params.render_process_id,
 451       params.render_view_id, url, params.page_url, mime_type, client,
 452       params.resource_context);
 453 }
 454
 455 void PluginServiceImpl::GetAllowedPluginForOpenChannelToPlugin(
 456     int render_process_id,
 457     int render_view_id,
 458     const GURL& url,
 459     const GURL& page_url,
 460     const std::string& mime_type,
 461     PluginProcessHost::Client* client,
 462     ResourceContext* resource_context) {
 463   WebPluginInfo info;
 464   bool allow_wildcard = true;
 465   bool found = GetPluginInfo(
 466       render_process_id, render_view_id, resource_context,
 467       url, page_url, mime_type, allow_wildcard,
 468       NULL, &info, NULL);
 469   base::FilePath plugin_path;
 470   if (found)
 471     plugin_path = info.path;
 472
 473   // Now we jump back to the IO thread to finish opening the channel.
 474   BrowserThread::PostTask(
 475       BrowserThread::IO, FROM_HERE,
 476       base::Bind(&PluginServiceImpl::FinishOpenChannelToPlugin,
 477                  base::Unretained(this),
 478                  render_process_id,
 479                  plugin_path,
 480                  client));
 481 }
 482
 483 void PluginServiceImpl::FinishOpenChannelToPlugin(
 484     int render_process_id,
 485     const base::FilePath& plugin_path,
 486     PluginProcessHost::Client* client) {
 487   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 488
 489   // Make sure it hasn't been canceled yet.
 490   if (!ContainsKey(pending_plugin_clients_, client))
 491     return;
 492   pending_plugin_clients_.erase(client);
 493
 494   PluginProcessHost* plugin_host = FindOrStartNpapiPluginProcess(
 495       render_process_id, plugin_path);
 496   if (plugin_host) {
 497     client->OnFoundPluginProcessHost(plugin_host);
 498     plugin_host->OpenChannelToPlugin(client);
 499   } else {
 500     client->OnError();
 501   }
 502 }
 503
 504 bool PluginServiceImpl::GetPluginInfoArray(
 505     const GURL& url,
 506     const std::string& mime_type,
 507     bool allow_wildcard,
 508     std::vector<WebPluginInfo>* plugins,
 509     std::vector<std::string>* actual_mime_types) {
 510   bool use_stale = false;
 511   PluginList::Singleton()->GetPluginInfoArray(
 512       url, mime_type, allow_wildcard, &use_stale, NPAPIPluginsSupported(),
 513       plugins, actual_mime_types);
 514   return use_stale;
 515 }
 516
 517 bool PluginServiceImpl::GetPluginInfo(int render_process_id,
 518                                       int render_view_id,
 519                                       ResourceContext* context,
 520                                       const GURL& url,
 521                                       const GURL& page_url,
 522                                       const std::string& mime_type,
 523                                       bool allow_wildcard,
 524                                       bool* is_stale,
 525                                       WebPluginInfo* info,
 526                                       std::string* actual_mime_type) {
 527   std::vector<WebPluginInfo> plugins;
 528   std::vector<std::string> mime_types;
 529   bool stale = GetPluginInfoArray(
 530       url, mime_type, allow_wildcard, &plugins, &mime_types);
 531   if (is_stale)
 532     *is_stale = stale;
 533
 534   for (size_t i = 0; i < plugins.size(); ++i) {
 535     if (!filter_ || filter_->IsPluginAvailable(render_process_id,
 536                                                render_view_id,
 537                                                context,
 538                                                url,
 539                                                page_url,
 540                                                &plugins[i])) {
 541       *info = plugins[i];
 542       if (actual_mime_type)
 543         *actual_mime_type = mime_types[i];
 544       return true;
 545     }
 546   }
 547   return false;
 548 }
 549
 550 bool PluginServiceImpl::GetPluginInfoByPath(const base::FilePath& plugin_path,
 551                                             WebPluginInfo* info) {
 552   std::vector<WebPluginInfo> plugins;
 553   PluginList::Singleton()->GetPluginsNoRefresh(&plugins);
 554
 555   for (std::vector<WebPluginInfo>::iterator it = plugins.begin();
 556        it != plugins.end();
 557        ++it) {
 558     if (it->path == plugin_path) {
 559       *info = *it;
 560       return true;
 561     }
 562   }
 563
 564   return false;
 565 }
 566
 567 string16 PluginServiceImpl::GetPluginDisplayNameByPath(
 568     const base::FilePath& path) {
 569   string16 plugin_name = path.LossyDisplayName();
 570   WebPluginInfo info;
 571   if (PluginService::GetInstance()->GetPluginInfoByPath(path, &info) &&
 572       !info.name.empty()) {
 573     plugin_name = info.name;
 574 #if defined(OS_MACOSX)
 575     // Many plugins on the Mac have .plugin in the actual name, which looks
 576     // terrible, so look for that and strip it off if present.
 577     const std::string kPluginExtension = ".plugin";
 578     if (EndsWith(plugin_name, ASCIIToUTF16(kPluginExtension), true))
 579       plugin_name.erase(plugin_name.length() - kPluginExtension.length());
 580 #endif  // OS_MACOSX
 581   }
 582   return plugin_name;
 583 }
 584
 585 void PluginServiceImpl::GetPlugins(const GetPluginsCallback& callback) {
 586   scoped_refptr<base::MessageLoopProxy> target_loop(
 587       base::MessageLoop::current()->message_loop_proxy());
 588
 589   if (LoadPluginListInProcess()) {
 590     BrowserThread::GetBlockingPool()->
 591         PostSequencedWorkerTaskWithShutdownBehavior(
 592             plugin_list_token_,
 593             FROM_HERE,
 594             base::Bind(&PluginServiceImpl::GetPluginsInternal,
 595                        base::Unretained(this),
 596                        target_loop, callback),
 597         base::SequencedWorkerPool::SKIP_ON_SHUTDOWN);
 598     return;
 599   }
 600 #if defined(OS_POSIX)
 601   std::vector<WebPluginInfo> cached_plugins;
 602   if (PluginList::Singleton()->GetPluginsNoRefresh(&cached_plugins)) {
 603     // Can't assume the caller is reentrant.
 604     target_loop->PostTask(FROM_HERE,
 605         base::Bind(callback, cached_plugins));
 606   } else {
 607     // If we switch back to loading plugins in process, then we need to make
 608     // sure g_thread_init() gets called since plugins may call glib at load.
 609     if (!plugin_loader_.get())
 610       plugin_loader_ = new PluginLoaderPosix;
 611     BrowserThread::PostTask(BrowserThread::IO, FROM_HERE,
 612         base::Bind(&PluginLoaderPosix::LoadPlugins, plugin_loader_,
 613                    target_loop, callback));
 614   }
 615 #else
 616   NOTREACHED();
 617 #endif
 618 }
 619
 620 void PluginServiceImpl::GetPluginsInternal(
 621      base::MessageLoopProxy* target_loop,
 622      const PluginService::GetPluginsCallback& callback) {
 623   DCHECK(BrowserThread::GetBlockingPool()->IsRunningSequenceOnCurrentThread(
 624       plugin_list_token_));
 625
 626   std::vector<WebPluginInfo> plugins;
 627   PluginList::Singleton()->GetPlugins(&plugins, NPAPIPluginsSupported());
 628
 629   target_loop->PostTask(FROM_HERE,
 630       base::Bind(callback, plugins));
 631 }
 632
 633 void PluginServiceImpl::OnWaitableEventSignaled(
 634     base::WaitableEvent* waitable_event) {
 635 #if defined(OS_WIN)
 636   if (waitable_event == hkcu_event_) {
 637     hkcu_key_.StartWatching();
 638   } else {
 639     hklm_key_.StartWatching();
 640   }
 641
 642   PluginList::Singleton()->RefreshPlugins();
 643   PurgePluginListCache(NULL, false);
 644 #else
 645   // This event should only get signaled on a Windows machine.
 646   NOTREACHED();
 647 #endif  // defined(OS_WIN)
 648 }
 649
 650 void PluginServiceImpl::RegisterPepperPlugins() {
 651   ComputePepperPluginList(&ppapi_plugins_);
 652   for (size_t i = 0; i < ppapi_plugins_.size(); ++i) {
 653     RegisterInternalPlugin(ppapi_plugins_[i].ToWebPluginInfo(), true);
 654   }
 655 }
 656
 657 // There should generally be very few plugins so a brute-force search is fine.
 658 PepperPluginInfo* PluginServiceImpl::GetRegisteredPpapiPluginInfo(
 659     const base::FilePath& plugin_path) {
 660   PepperPluginInfo* info = NULL;
 661   for (size_t i = 0; i < ppapi_plugins_.size(); ++i) {
 662     if (ppapi_plugins_[i].path == plugin_path) {
 663       info = &ppapi_plugins_[i];
 664       break;
 665     }
 666   }
 667   if (info)
 668     return info;
 669   // We did not find the plugin in our list. But wait! the plugin can also
 670   // be a latecomer, as it happens with pepper flash. This information
 671   // can be obtained from the PluginList singleton and we can use it to
 672   // construct it and add it to the list. This same deal needs to be done
 673   // in the renderer side in PepperPluginRegistry.
 674   WebPluginInfo webplugin_info;
 675   if (!GetPluginInfoByPath(plugin_path, &webplugin_info))
 676     return NULL;
 677   PepperPluginInfo new_pepper_info;
 678   if (!MakePepperPluginInfo(webplugin_info, &new_pepper_info))
 679     return NULL;
 680   ppapi_plugins_.push_back(new_pepper_info);
 681   return &ppapi_plugins_[ppapi_plugins_.size() - 1];
 682 }
 683
 684 #if defined(OS_POSIX) && !defined(OS_OPENBSD) && !defined(OS_ANDROID)
 685 // static
 686 void PluginServiceImpl::RegisterFilePathWatcher(FilePathWatcher* watcher,
 687                                                 const base::FilePath& path) {
 688   bool result = watcher->Watch(path, false,
 689                                base::Bind(&NotifyPluginDirChanged));
 690   DCHECK(result);
 691 }
 692 #endif
 693
 694 void PluginServiceImpl::SetFilter(PluginServiceFilter* filter) {
 695   filter_ = filter;
 696 }
 697
 698 PluginServiceFilter* PluginServiceImpl::GetFilter() {
 699   return filter_;
 700 }
 701
 702 void PluginServiceImpl::ForcePluginShutdown(const base::FilePath& plugin_path) {
 703   if (!BrowserThread::CurrentlyOn(BrowserThread::IO)) {
 704     BrowserThread::PostTask(
 705         BrowserThread::IO, FROM_HERE,
 706         base::Bind(&PluginServiceImpl::ForcePluginShutdown,
 707                    base::Unretained(this), plugin_path));
 708     return;
 709   }
 710
 711   PluginProcessHost* plugin = FindNpapiPluginProcess(plugin_path);
 712   if (plugin)
 713     plugin->ForceShutdown();
 714 }
 715
 716 static const unsigned int kMaxCrashesPerInterval = 3;
 717 static const unsigned int kCrashesInterval = 120;
 718
 719 void PluginServiceImpl::RegisterPluginCrash(const base::FilePath& path) {
 720   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 721   std::map<base::FilePath, std::vector<base::Time> >::iterator i =
 722       crash_times_.find(path);
 723   if (i == crash_times_.end()) {
 724     crash_times_[path] = std::vector<base::Time>();
 725     i = crash_times_.find(path);
 726   }
 727   if (i->second.size() == kMaxCrashesPerInterval) {
 728     i->second.erase(i->second.begin());
 729   }
 730   base::Time time = base::Time::Now();
 731   i->second.push_back(time);
 732 }
 733
 734 bool PluginServiceImpl::IsPluginUnstable(const base::FilePath& path) {
 735   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 736   std::map<base::FilePath, std::vector<base::Time> >::const_iterator i =
 737       crash_times_.find(path);
 738   if (i == crash_times_.end()) {
 739     return false;
 740   }
 741   if (i->second.size() != kMaxCrashesPerInterval) {
 742     return false;
 743   }
 744   base::TimeDelta delta = base::Time::Now() - i->second[0];
 745   return delta.InSeconds() <= kCrashesInterval;
 746 }
 747
 748 void PluginServiceImpl::RefreshPlugins() {
 749   PluginList::Singleton()->RefreshPlugins();
 750 }
 751
 752 void PluginServiceImpl::AddExtraPluginPath(const base::FilePath& path) {
 753  if (!NPAPIPluginsSupported()) {
 754     // TODO(jam): remove and just have CHECK once we're sure this doesn't get
 755     // triggered.
 756     DLOG(INFO) << "NPAPI plugins not supported";
 757     return;
 758   }
 759   PluginList::Singleton()->AddExtraPluginPath(path);
 760 }
 761
 762 void PluginServiceImpl::RemoveExtraPluginPath(const base::FilePath& path) {
 763   PluginList::Singleton()->RemoveExtraPluginPath(path);
 764 }
 765
 766 void PluginServiceImpl::AddExtraPluginDir(const base::FilePath& path) {
 767   PluginList::Singleton()->AddExtraPluginDir(path);
 768 }
 769
 770 void PluginServiceImpl::RegisterInternalPlugin(
 771     const WebPluginInfo& info,
 772     bool add_at_beginning) {
 773   if (!NPAPIPluginsSupported() &&
 774       info.type == WebPluginInfo::PLUGIN_TYPE_NPAPI) {
 775     DLOG(INFO) << "Don't register NPAPI plugins when they're not supported";
 776     return;
 777   }
 778   PluginList::Singleton()->RegisterInternalPlugin(info, add_at_beginning);
 779 }
 780
 781 void PluginServiceImpl::UnregisterInternalPlugin(const base::FilePath& path) {
 782   PluginList::Singleton()->UnregisterInternalPlugin(path);
 783 }
 784
 785 void PluginServiceImpl::GetInternalPlugins(
 786     std::vector<WebPluginInfo>* plugins) {
 787   PluginList::Singleton()->GetInternalPlugins(plugins);
 788 }
 789
 790 bool PluginServiceImpl::NPAPIPluginsSupported() {
 791 #if defined(OS_WIN) || defined(OS_MACOSX) || defined(OS_BSD) || \
 792     (defined(OS_LINUX) && !defined(USE_AURA))
 793   return true;
 794 #else
 795   return false;
 796 #endif
 797 }
 798
 799 void PluginServiceImpl::DisablePluginsDiscoveryForTesting() {
 800   PluginList::Singleton()->DisablePluginsDiscovery();
 801 }
 802
 803 #if defined(OS_MACOSX)
 804 void PluginServiceImpl::AppActivated() {
 805   BrowserThread::PostTask(BrowserThread::IO, FROM_HERE,
 806                           base::Bind(&NotifyPluginsOfActivation));
 807 }
 808 #elif defined(OS_WIN)
 809
 810 bool GetPluginPropertyFromWindow(
 811     HWND window, const wchar_t* plugin_atom_property,
 812     base::string16* plugin_property) {
 813   ATOM plugin_atom = reinterpret_cast<ATOM>(
 814       GetPropW(window, plugin_atom_property));
 815   if (plugin_atom != 0) {
 816     WCHAR plugin_property_local[MAX_PATH] = {0};
 817     GlobalGetAtomNameW(plugin_atom,
 818                        plugin_property_local,
 819                        ARRAYSIZE(plugin_property_local));
 820     *plugin_property = plugin_property_local;
 821     return true;
 822   }
 823   return false;
 824 }
 825
 826 bool PluginServiceImpl::GetPluginInfoFromWindow(
 827     HWND window,
 828     base::string16* plugin_name,
 829     base::string16* plugin_version) {
 830   if (!IsPluginWindow(window))
 831     return false;
 832
 833   GetPluginPropertyFromWindow(
 834           window, kPluginNameAtomProperty, plugin_name);
 835   GetPluginPropertyFromWindow(
 836           window, kPluginVersionAtomProperty, plugin_version);
 837   return true;
 838 }
 839
 840 bool PluginServiceImpl::IsPluginWindow(HWND window) {
 841   return gfx::GetClassName(window) == base::string16(kNativeWindowClassName);
 842 }
 843 #endif
 844
 845 }  // namespace content